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5/31/2024
WT Staff
 HAPPENING NOW
Friday, May 31, 2024
NWS: Flood Watch for the northwest
May 31, 2024 updated 245 pm CDT
Flood Watch issued by National Weather Service at 632 am CDT Friday May 31, 2024
FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...Flooding caused by excessive rainfall continues to be possible in portions of Arkansas, including the following counties, Columbia, Hempstead, Lafayette, Nevada and Union, Louisiana,
including the following parishes, Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto, Grant, Jackson, La Salle, Lincoln,
Natchitoches, Ouachita, Red River, Sabine, Union, Webster and Winn, and Texas, including the following counties, Angelina,
Cherokee, Nacogdoches, Panola, Rusk, Sabine, San Augustine and Shelby.
Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Excessive, heavy rainfall will continue across the Flood Watch area through Friday and Friday evening with 1 to 3 inches of additional rainfall possible with isolated higher amounts. Soil conditions remain very saturated from previous rainfall over the past week and therefore, the flash flood threat will only increase through Friday and Friday evening from additional forecasted rainfall.
Monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
Impacting Caddo-Bossier-Webster-Claiborne-Lincoln-De Soto-Red River-Bienville-Jackson-Ouachita-Sabine-Natchitoches-Winn-Grant-Caldwell-La Salle Parishes
WT USA Flows and Flood Tracker provisional data from the network of USGS streamflow monitors
Forty-nine streamflow gauges are recording above flood stage across the USA Friday, up from forty-four this morning. Three cases are observed in the WT coverage area, one in Georgia and two in Louisiana.
Louisiana Bayou Dorcheat flooding was short-lived near Springhill, the flow level getting back inside the channel before noon, less than eight hours of flooding recorded. While the Region 1 flood ended, another Region 4 site started taking on a large flow volume, the Calcasieu River breaching flood stage near Glenmora right after lunch hour today. This location is provisionally recorded an inch over flood stage on an increasing flow volume trend. Sabine River continues to overflow the lower channel at a higher level than reported earlier today, this could be due to tidal water influence near Ruliff TX. A flood watch remains in effect for the northwest until 1 am tonight. According to the hazardous weather outlook, thunderstorms with damaging wind gusts are the primary threat, tornadoes cannot be ruled out. See black tags indicating flow volume and gauge height, flows updated daily on the map to the right.
Georgia: Atlantic basin's Satilla River is down an inch since the initial report today, five inches over the channel in Atkinson County, still coming down. We expect to see this flooding ending by this time tomorrow. See black tag indicating flow volume and gauge height, flows updated daily here.
HABs Tracker
National Centers for Coastal Ocean Science (NCCOS) Satellite HAB monitoring Program
HAB tracking in Louisiana from the NCCOS satellite photo capturing the entire southeast region. The imaging picks up markers for HABs showing presence, location and extent, when matched with the concentration color scale provide an accurate assessment. The limitations of the satellite monitoring program are three-fold. Low concentration to moderate concentration HABs may not show up at all. Wind speed in excess of 4 mph can cause the HAB mat to submerge and therefore not show up on the image. Lastly, clouds can obscure the view of the water bodies, in which case, no interpretation of HABs is possible. As NCCOS uploads a new satellite image almost daily, WTLA examines the image and provides a description.
The latest satellite image of southeast LA was captured May 30 at a surface wind speed 16.1 mph. In this mostly clear image, we see the highest concentration HAB in Lake Palourde, up to 1.5 million cells per 100 ml on the west shore. Lake Pontchartrain and Lake Maurepas both appear HAB free. For more information, see the bluegreen tags on the map to the right.
As many drinking water facilities are supplied from surface water reservoirs, the streamflow situation is pertinent to both drinking water supply and quality. High flows can stir up sediment and cause turbidity in the reservoirs, requiring additional treatments to render the water potable. Low flow volume is linked to warmer temperatures in the reservoir and can be an issue for water quality where HABs are present. WT tracks streamflow trends with an eye to the impacts on drinking water supply and quality in each of the state's watersheds. Check the watershed layer on the map to see the direction of flow and streamflows that may be impacting drinking water today.
USGS Provisional Data Statement
Data are provisional and subject to revision until they have been thoroughly reviewed and received final approval. Current condition data relayed by satellite or other telemetry are automatically screened to not display improbable values until they can be verified.
Provisional data may be inaccurate due to instrument malfunctions or physical changes at the measurement site. Subsequent review based on field inspections and measurements may result in significant revisions to the data.
Data users are cautioned to consider carefully the provisional nature of the information before using it for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Information concerning the accuracy and appropriate uses of these data or concerning other hydrologic data may be obtained from the USGS.
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